Printing telegraph apparatus



Dec. 3, 1940. M; DRESSLER ETAL 2,223,820

PRINT ING TELEGRAPH APPARATUS Filed Sept. 1, 1937 '2 Sheets-Sheet 1 FIG1 44 I8 INVENTOR.

MAX DRESSLER WILLY SKAWRAN A TORNEY.

3, 1940- M. DRESSLER arm. 2,223,320

PRINTING TELEGRAPH APPARATUS Filed Sept. 1, 1937 2 Sheets-Sheet 2 F IG.3

INVENTOR. MAX DRESSLER WILLY SKAWRAN i 9 .F Sh.

Patented Dec. 3, 1940 UNITED v STATES PATENT OFFICE Shaman,Berlin-Spandau, Germany, to Siemens, &. Halske,

assignors Aktiengesellachaft,

Siemensstadt, near Berlin, Germany, a corporation oi Germany ApplicationSeptember 1, 1937, Serial No. 161,958 1 In Germany September 1", 1936 3'Claims.

This invention relates to printing telegraph apparatus and moreparticularly to telegraph apparatus wherein the individual charactersymbols are composed of impulses corresponding to 5 portions of thesymbols.

An object of the invention is the provision of a transmitter which issimple, compact, and-reliable for the precise transmission of groups ofimpulses identified with and peculiar to each character symbol.

I 'A feature of the invention resides inthe arrangement of the,transmitting and receiving components in a unitary unit.

The. above and other objects of the invention are acomplished throughthe provision of an impulse, transmitter including a plurality of discsorcams, one individual to each character to, be transmitted, and eachhaving its periphery formed distinctly for. each character, which areeffective,l"deper 1dingv on a key lever 01 a, keyboard depressed, .on asinglecontactflto cause thereby the precise transmission ofiimpulsessymbolic of the characterv for. each key lever. When used in start-stopsystems, the. stopimpulse is generated by a cam operated. contact whenthe cam shaiton which the character. cams are also mounted isfinits restor normal position, .When

the. foam, leaves its restposition, the contact is opened andthestartimpjillse is transmitted. A

3 pecial contact may. also be" provided wher by the:

release circuit isopened-inresponse to a start i p, l ewh n the it inmes and: receiver bothjtransrnitter mote transmitter 1 as, the, resultb1- the operation of the. transmitting contact isthus avoided,

e on ma be has; rom the, low sc pti n, ke I in conjunction with theaccompanying drawingsj'wherein, s srammim vt a ement. o the eivi m an mmne a mponents of. rinting telegraph apparatus "in accordance; with thepresent invention;

r 2 shows diagrammatically a certain por- ":n brine transmitter; ens, tr

3 shows a further. port n or embodiment ofthe transmitter. As,symbolized in the drawings, referringpare ticularlyf to Fig, 1-, thetransmitter includes a 50 plurality of key leversl 8 arranged in severalrows as ise customary in transmitters for te1e-, 'graphic'communication.Eachoithe key levers i isipivoted on a rodsuch as 6, it being, ofcourse, understood that there isya rod 6; individual to 55 eachhorizontal row of key levers 5. Attached to isturbanceeby 9 ration oithe re-n A full and complete understanding of. the inspect' to contacts.12 cents.

each key lever 5 is a vertically extending bar 1 which is normally underthe tension of a spring 8 and which has near its free end a notch 9.

As indicated, there is a bar 1 individual to each key lever 5 of thekeyboard. Consequently, Y 5 according to an embodimentoi the invention acam l0 mounted on a shaft H is provided individual to each of thebars'l. The periphery oi each of the cams I0 is cut difierently. Infact, i the periphery of each cam ill is cut distinctively 10 for eachcharacter, impulses corresponding to which are to be transmitted andrecorded by, the

receiver connected to the, signalling channel which may be;either a wirechannel or aradio channel. In other words, there is a cam i0 indi- 15vidual to each of the characters, impulses corre spending to which areto be transmitted to a distant station.

Transmission oi impulses allocated to each of the characters isfachievedthrough the operation 20 pulses. correspondingrthereto will beimpressed- 25 from the source of; current I! on the conductors i3 andI4. Operatively connected to contacts I} is a counterpoise l fipivotedat ilfand; haying; a: flan e t. its re eefwhi s e sms d ar ets I the otCrme in assent the-beret m: tens t e te ds aest r s mtmakex 9!?! in s. Alatta hes-s 1 that itch;

h ir 1 l eels he pe at on; at waster: poise it and consequently the:actuation ofcon: teeters,

o s i e w scisii h1- iil s It n n n a'lareoperatsdb! a ni a e u m n tmt-P0 ne; h

bwt e ke a s w th we animation Referring a ai -tench, itisnoted; thatwhen, any one.v of th ken, vers i; is depressed,

\ universal-t bail is is alsojoperated, and; contacts e r q r me sl teir, flect v nees r o ac I1 tw ed an ralt ele ivemountedbn siren lyreieemgzc. which, in

its norma re e tment a -u to, hold, contacts, l2, normally closed;"when, the s a t 18 in t Intonati n; asisco m nrac- H s a ne e emvnfsvsems I th t e tacts I: closed lunder tuch conditions current is no lBPPIied to du fltors 1 a d. l-Wh h is symbolic of; the rest condition oithe system.

Bar-'2 I is urge'dfin, cooperationwith, scam Iii by a spring 22 and hasformed in its upper iree end a notchfzi. li o 'ined in the end of bar2], oppo':

'mally is under the action of a spring 27.

site to the end wherein the notch 23 is formed is a projection 24 whichis normally engaged by a bail 25 carried by a pivoted lever 26 whichnor- Ball 25, being common to each of the key levers will be depressedupon the depression of any of the key levers and will thus operateagainst the action of spring 27 and cause movement of bar 2| sufficientto bring notch 23 in alignment with the projection formed on the freeend of counterpoise i5. Under such conditions, the counterpoise IE willbe shifted from the position shown in Fig. 2 to the position shown inFig. l, wherein the contacts I2 are opened and current is removed fromthe line. Inasmuch as contact|8 is also opened upon the depression of akey lever 5 and the operation of bail IS, the circuit including theconductors 3 and I4 is opened and the telegraph apparatus is startedinto operation.

The transmitting cam shaft must be arrested after each revolution sothat a symbol or a group of impulses indicative thereof is notrepeatedly transmitted if the key therefor is held depressed for aperiod longer than the. time required for the transmitting shaft H tocomplete one cycle of rotation. In order to achieve such a result, alever 28 which cooperates with cam 20 and which has secured to its lowerend a pin 29 in engagement with the lower extremity of bar 2| isprovided. Lever 28 is normally under the tension of a spring 30 whichtends to hold pin 29 out of engagement with the lower end of bar 2|.However, upon the rotation of cam 20, lever 28 is rotated about itspivot against the action of spring 30 for moving bar 2| sufficiently toefiect the disengagement of projection 24 from ball 25. Bar 2| thereuponis restored to its'vertical normal position by the action of its spring22. Subsequently, contacts l2 are closed by cam 20 and current is againapplied to conductors I3 and I4 for the energization of the start magnetthrough which the transmitting shaft II is arrested.

Also secured to transmitting shaft II is a cam 32 which operates alever-33 against the action of a spring 34. The lower end of lever 33carries a bail 35 which extends transversely of each row of key leversand which serves to maintain the depressed key lever operated and toprevent the operation of another key lever pending the restoration ofthe previously depressedfkey lever 5 to its normal or undepressedcondition. Such a result is achieved by forming in the upper edge ofeach of the key levers 5 a hook portion 36' which is designed tocooperate with bail 35 in a manner such that the depressed key leverwill be maintained depressed for the cycle ofro'tation of transmittingshaft H and the other undepressed key levers will be locked againstdepres sion for the cycle of operation of the transmitting shaft II. I

Referring now to Fig. l, the line conductors I3 and I4 extend, dependingupon whether contactblade. 38 is in contact with switch member 39 or 40,through the winding of electromagnets 4| or 42, respectively.Electromagnet 4| which constitutes the start magnet,.js normallyenergized due to. the fact that the contacts |2, as s own in Fig. 2, arenormally closed. Consequently,

stop member 43 secured to the armature of electromag'net 4|, normallylies in the path of stop lug 44"s'ecured to transmitting shaftll. Undersuch conditions, when a key lever is depressed,

aaeaeae contacts i2 will be opened. Current is thereupon removed fromthe line conductors i3 and E i and electromagnet 4| will be deenergized.Upon deenergization, the armatureof electromagnet M moves stopprojection 43 out of the path of stop lug 4 and releases transmittingshaft H, which normallytends to rotate by power communicated from amotor through a friction clutch which is released for rotation. V

Electromagnet 42 constitutes the receiving or printing magnet of thereceiver and responds to the operation of contacts I2 in accordance withthe rotation of cam I8 rendered effective on bar I through the operationof a particular key lever 5. Electromagnet 42 controls a pressure bladeor hammer 45 which cooperates with a rotating spiral 46 to record thecharacter symbols, as is fully disclosed in Patent No. 2,046,328 to E.E. K einschmidt et al., granted July 7, 1936. Spiral drum 46 is securedto shaft 41 which also carries a gear 48 meshed with a gear 49 securedto shaft 50 of the receiving component of the combined 39 to include thewinding of electromagnet 4| in the conductors I3 and I4. However, duringrotation of cam 5|, switch member is moved into contact with switchblade 38, so that the winding of electromagnet 42 is included in theconductors l3 and I4 and the winding of electromagnet 4| is excludedtherefrom.

Under certain conditions it may be found desirable to utilize positiveand negative current conditions which are used in wireless transmission. To make possible the use of apparatus con-1 stituting a part ofthe present invention for such purpose, an additional contact 52, shownin dotted outline in- Figs. 1 and 2, may be provided. With thearrangement of the contacts as indicated,

" transmission may'be accomplished through the use of-polar signals.

, apparatus for it may be embodied in avariety of different forms ofapparatus without departing from the spirit and scope of the invention.

What is claimed is: 1. A telegraph transmitter including a plurality ofkey levers, a plurality of members one for each character, impulsesindicative of which are to be transmitted, means operated by said keylevers for rendering said members individually effective, and meanscommon to all of said members and operated by each member through saidmeans for transmitting impulses in accordance with the operated memberand distinctive of the character identified therewith.

2. A telegraph transmitter including a plurality of key levers, anoperating shaft, a plurality of cams on said shaft each having itsperiphery formed .with projections corresponding to the individualimpulses characteristic of the character allocated thereto, meansoperated by said key levers for rendering said cams individuallyeffective, and means common to all of said cams and operated by each camthrough said means for transmitting the impulses determined by theprojections on the periphery ofthe then effective cam.

3. A telegraph transmitter including a plurality of key levers, anoperating shaft, a plurality of cams secured to said shaft each of saidcams having its periphery formed with projections corresponding to theindividual impulses representative of the character to which said cam isallotive of different characters, a universal ball, a

start cam also secured to said shaft, a transmitting contact, andmeansoperated by. said ball through the operation of a key lever forrendering said start cam effective to eifect through the operation ofsaid contact the transmission of a start signal and thereafter one ofsaid plurality of cams for the transmission of the character identifyingimpulses.

5. A telegraph transmitter including a plurality of key levers, anoperating shaft, a plurality of character cams secured to said shafteach of said cams having its periphery formed with projectionscorresponding to the impulses individual to each character, a start camalso secured to said shaft, a transmitting contact, means common to thecams identified with the character and the start impulses, and meansoperated by said key levers for rendering said start cam and saidcharacter cams effective through said common means on said contactsuccessively to effeet the transmission of a start impulse followed by aseries of character impulses.

6. A telegraph transmitter including a plurality of key levers, anoperating shaft, a plurality of members carried by said shaft each ofsaid members being identified with a particular character and arrangedto control the transmission of impulses identified with the characterallocated thereto, means for causing the transmission of a startimpulse, means controlled by each of said key levers for rendering themember individual thereto effective for the transmission of impulses forthe character thereof, and means operated in timed relatlonwith respectto said members for insuring that a stop impulse will be transmitted atthe end of transmission of the character impulses regardless of thecontinued operation of the key lever through the operation of which thestart impulse was transmitted.

'7. A telegraph transmitter including a plurality of key levers, aplurality of members, one

for each character, impulses indicative of which are'to be transmitted,a single transmitting contact, means operated by saidkey levers forrendering said members individually effective on said contact, anadditional set of contacts con-v nected in circuit with saidtransmitting contact, a

and means operated upon the depression of any of said key levers foroperating said additional contacts.

8. A telegraph system including a receiver comprising starting andprinting mechanisms-and a transmitter including a plurality of membersone for each character, impulses indicative of which are to betransmitted, a plurality of key levers, means operated by said keylevers for rendering said members individually effective,

means common to said members and operated by each member fortransmitting impulses in accordance with the operated member, means 01)-erative upon the depression of a key lever for transmitting a startimpulse, and means effective in response to a start impulse forrendering said starting mechanism ineffective and said printingmechanism effective.

- MAX DRESSLER.

WILLY SKAWRAN.

